Stimulated Raman Effect in Ortho-Phosphoric Acid

Abstract

Stimulated Raman emissions from phosphoric acid solutions of varying concentrations were studied. A 99% concentrated solution produced one Raman line (910 cm−1). However, the solution of concentration ≤85% produced three more sharp lines close to the Raman line (910 cm−1) which were not observed earlier in the corresponding spontaneous Raman effect. It was also found that no Raman line shifted its position when the concentration of the solution was varied, contrary to the earlier observations on the corresponding spontaneous Raman emission (914 cm−1). The stimulated Raman emissions were found sharp even under multimode excitations.